Same absolute path works for \input but does not work for \include, why?

If I use the command "\input{filepath}" then the file is perfectly printed in "main.tex". If I only change the command to "\include{filepath}" I get the following error:

I can't write on file `filepath.aux'.

With the AUX extension, even though is a .tex file.

Ex post: I have a Mac with MacOS Sierra

`\input` only needs read permission, but `\include` writes an aux file for each included file, so it needs write permission.